Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
cu tren » dua tren
tu tren » tu truyen, tu trong, dua tren
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang x ho. hieu van cam xuc va hanh vi ((cu tren) or (((tu tren) or (tu tieng))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. hieu van cam xuc va hanh vi ((cu tren) OR (((tu tren) OR (tu tieng)))).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. hieu van cam xuc va hanh vi ((cu tren) or (((tu tren) or (tu tieng))))*.